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<p>[QUOTE=&quot;desertgem, post: 7529907, member: 15199&quot;]You can buy a set of calibration weights all the&nbsp; way down to 0.1mg if you are weighing pharmaceutical material. A set good enough to measure ultra precious gemstones or elements is usually under $200, but they have to be protected from oxidation or other chemical change, If you want a company will certify the weight for 3 mo-year for a few under dollars. Some materials gets heavier in air, others get lighter. I would like to know what the coin graders have available.&nbsp; Jim[/QUOTE]</p><p><br /></p>

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